unplugging vvti - Toyota Yaris Forums

yaris9876 · 03-18-2010, 01:18 PM

my Yaris is running bad still. It might be the cam timing gear telling the ecu to up the idle ..
its racing and generally rough.
Do you think the 1.5 would run without the cam vvti..??? I dont know if that might help..
I was thinking of unplugging it...

jambo101 · 03-19-2010, 06:42 AM

Your symptoms sound like a vacuum leak..

Yaris Hilton · 03-19-2010, 10:53 AM

You'll get a CEL if you unplug the VVT-i actuator. As the cam will then remain in its fully retarded position all the time, it won't run the best either.

MUSKOKA800 · 03-19-2010, 01:52 PM

What's the scan tool say?

yaris9876 · 03-19-2010, 09:30 PM

I got the P0011 which is consistent with the Service bulletins on the 07 1.5L
It tells the mechaanic to check the vvti first and if it works replace the cam timing gear which is a handy 450 bucks. Good for the sleazy dealer.
I pulled the vvti and put 12v to it and it works but it could be sticking on the return.Its hard to know. It might be the cam gear but the racing rpm would have to be a side effect at least.
If the vvti pin sticks on the return the ecu might pump the gas because it thinks you are
cruising above 4000 rpm on the hiway. The only time the vvti would extend anyway.
I unplugged the vvti and will run for awhile. Yes I got P0016 code but I dont care. It should still work. The old compacts didnt have a vvti anyway.
I am getting sick of this buggy. I want out but I dont want to buy now. I wish I could put a brand new corolla engine in it from a few years ago. They were good. And very few people
outside of California know these things. In the North they have hardly seen these.

yaris9876 · 03-20-2010, 04:09 PM

I got rid of the racing rpm by unplugging the vvti, but the idle is a bit high still ..
but its idling smoother and running ok . Big improvement from before.

bronsin · 03-22-2010, 08:40 AM

Is the cam profile without the vvti engaged like that of cars without vvti (at all)?

Tamago · 03-22-2010, 08:59 AM

how often to you change your oil?

yaris9876 · 03-22-2010, 11:13 AM

????????????? plenty

Tamago · 03-22-2010, 11:35 AM

Quote:

Originally Posted by yaris9876

????????????? plenty

just checking. the vvti solenoid likes clean oil.

it sounds like you need to find the REAL source of your problems, unplugging stuff doesn't fix anything.

YarisSedan · 03-22-2010, 01:10 PM

Even if it did work the poor fuel economy that would result but disabaling the VVTI would more than offset the cost of just fixing it over time.

yaris9876 · 03-22-2010, 11:38 PM

will get 35 instead of 40 good enough better than 18

127.0.0.1 · 03-23-2010, 09:35 AM

disabling VVTI will mostly just kill acceleration and torque. it won't wind up as fast

Yaris Hilton · 03-23-2010, 10:38 AM

VVT-i is disabled when the "COOL!" light on your dash is on. It'll run like that. (With the transmission upshifting normally, presumably.)

03-18-2010, 01:18 PM	#1
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	unplugging vvti my Yaris is running bad still. It might be the cam timing gear telling the ecu to up the idle .. its racing and generally rough. Do you think the 1.5 would run without the cam vvti..??? I dont know if that might help.. I was thinking of unplugging it...

03-19-2010, 01:52 PM	#4
MUSKOKA800 Drives: '08 Yaris Sedan, Aero Package Join Date: Oct 2008 Location: Burlington, Ontario, Canada Posts: 1,720	What's the scan tool say? __________________ TRD Upgrades: 18" Wheels wrapped in 215/35/18 PZero's, Sportivo Shocks/Struts, Lowering Springs, Swaybar, Axle-Back Exhaust, Oil Cap, Rad Cap, Signage. Aftermarket Goodies: Piggies SS, K&N Drop-In, Blitz S/C, DC Header, NST Pulley) Toyota Options/Accessories: Sport Pedal Covers, Sport Shift Knob, Ipod Interface, Summer Mats, Winter Mats, Cruise Control, Auto-Dim Mirror, Echo steelies with winter boots.

03-22-2010, 01:10 PM	#11
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Even if it did work the poor fuel economy that would result but disabaling the VVTI would more than offset the cost of just fixing it over time. __________________ http://www.cardomain.com/ride/3210549

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03-19-2010, 06:42 AM	#2
jambo101 Drives: yaris 08 sedan Join Date: Oct 2008 Location: Montreal Canada Posts: 1,286	Your symptoms sound like a vacuum leak..

03-19-2010, 10:53 AM	#3
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	You'll get a CEL if you unplug the VVT-i actuator. As the cam will then remain in its fully retarded position all the time, it won't run the best either.

03-19-2010, 09:30 PM	#5
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	I got the P0011 which is consistent with the Service bulletins on the 07 1.5L It tells the mechaanic to check the vvti first and if it works replace the cam timing gear which is a handy 450 bucks. Good for the sleazy dealer. I pulled the vvti and put 12v to it and it works but it could be sticking on the return.Its hard to know. It might be the cam gear but the racing rpm would have to be a side effect at least. If the vvti pin sticks on the return the ecu might pump the gas because it thinks you are cruising above 4000 rpm on the hiway. The only time the vvti would extend anyway. I unplugged the vvti and will run for awhile. Yes I got P0016 code but I dont care. It should still work. The old compacts didnt have a vvti anyway. I am getting sick of this buggy. I want out but I dont want to buy now. I wish I could put a brand new corolla engine in it from a few years ago. They were good. And very few people outside of California know these things. In the North they have hardly seen these.

03-20-2010, 04:09 PM	#6
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	I got rid of the racing rpm by unplugging the vvti, but the idle is a bit high still .. but its idling smoother and running ok . Big improvement from before.

03-22-2010, 08:40 AM	#7
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	Is the cam profile without the vvti engaged like that of cars without vvti (at all)?

03-22-2010, 11:13 AM	#9
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	????????????? plenty

03-22-2010, 11:38 PM	#12
yaris9876 Drives: yaris hatch 07 640K original m Join Date: Mar 2007 Location: usa Posts: 285	will get 35 instead of 40 good enough better than 18

03-23-2010, 09:35 AM	#13
127.0.0.1 Banned Drives: '10 Yaris5drHB+99 4runner LTD Join Date: Sep 2009 Location: NE Posts: 672	disabling VVTI will mostly just kill acceleration and torque. it won't wind up as fast

03-23-2010, 10:38 AM	#14
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	VVT-i is disabled when the "COOL!" light on your dash is on. It'll run like that. (With the transmission upshifting normally, presumably.)